package xyz.txcplus.redis.lock;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

/**
 * @author: TXC
 * @date: 2020-07-03 14:03
 */

@Component
@Slf4j
public class RedisLock {
    @Autowired
    private StringRedisTemplate redisTemplate;


    /**
     * 加锁
     * @param key
     * @param value 当前时间+超时时间
     * @return
     */
    public boolean lock(String key, String value) {

        if (redisTemplate.opsForValue().setIfAbsent(key, value)) {

            return true;

        }

        String currentValue = redisTemplate.opsForValue().get(key);

        if (!StringUtils.isEmpty(currentValue)
                && Long.parseLong(currentValue) < System.currentTimeMillis()) {

            String oldValue = redisTemplate.opsForValue().getAndSet(key, value);
            if (!StringUtils.isEmpty(oldValue)
                    && oldValue.equals(currentValue)) {

                return true;

            }
        }

        return false;
    }


    /**
     *
     * 解锁
     * @param key
     * @param value
     */
    public void unlock(String key, String value) {

        try{
            String currentValue = redisTemplate.opsForValue().get(key);

            if (!StringUtils.isEmpty(currentValue)
                    && currentValue.equals(value)) {

                redisTemplate.opsForValue().getOperations().delete(key);

            }
        }catch (Exception e){
            log.error("使用redis解锁发生异常:{}",e.getMessage());
        }


    }
}
